prosody
0c62bed9d338
util/sasl.lua

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util/sasl.lua @ 2006:0c62bed9d338

MUC: Added support for reason messages in role and affiliation changes (e.g., reason for kick, etc).
author Waqas Hussain <waqas20@gmail.com>
date Sun, 18 Oct 2009 15:53:08 +0500
parent 1725:fb3137652ea6
child 2078:a5f154548154
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1 -- sasl.lua v0.4
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2 -- Copyright (C) 2008-2009 Tobias Markmann
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3 --
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4 -- All rights reserved.
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5 --
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6 -- Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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7 --
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8 -- * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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9 -- * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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10 -- * Neither the name of Tobias Markmann nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
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11 --
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12 -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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13
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14
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15 local md5 = require "util.hashes".md5;
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16 local log = require "util.logger".init("sasl");
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17 local tostring = tostring;
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18 local st = require "util.stanza";
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19 local generate_uuid = require "util.uuid".generate;
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20 local t_insert, t_concat = table.insert, table.concat;
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21 local to_byte, to_char = string.byte, string.char;
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22 local to_unicode = require "util.encodings".idna.to_unicode;
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23 local s_match = string.match;
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24 local gmatch = string.gmatch
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25 local string = string
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26 local math = require "math"
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27 local type = type
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28 local error = error
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29 local print = print
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30
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31 module "sasl"
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32
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33 -- Credentials handler:
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34 -- Arguments: ("PLAIN", user, host, password)
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35 -- Returns: true (success) | false (fail) | nil (user unknown)
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36 local function new_plain(realm, credentials_handler)
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37 local object = { mechanism = "PLAIN", realm = realm, credentials_handler = credentials_handler}
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38 function object.feed(self, message)
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39 if message == "" or message == nil then return "failure", "malformed-request" end
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40 local response = message
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41 local authorization = s_match(response, "([^%z]+)")
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42 local authentication = s_match(response, "%z([^%z]+)%z")
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43 local password = s_match(response, "%z[^%z]+%z([^%z]+)")
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44
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45 if authentication == nil or password == nil then return "failure", "malformed-request" end
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46 self.username = authentication
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47 local auth_success = self.credentials_handler("PLAIN", self.username, self.realm, password)
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48
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49 if auth_success then
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50 return "success"
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51 elseif auth_success == nil then
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52 return "failure", "account-disabled"
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53 else
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54 return "failure", "not-authorized"
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55 end
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56 end
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57 return object
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58 end
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59
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60 -- credentials_handler:
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61 -- Arguments: (mechanism, node, domain, realm, decoder)
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62 -- Returns: Password encoding, (plaintext) password
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63 -- implementing RFC 2831
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64 local function new_digest_md5(realm, credentials_handler)
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65 --TODO complete support for authzid
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66
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67 local function serialize(message)
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68 local data = ""
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69
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70 if type(message) ~= "table" then error("serialize needs an argument of type table.") end
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71
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72 -- testing all possible values
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73 if message["realm"] then data = data..[[realm="]]..message.realm..[[",]] end
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74 if message["nonce"] then data = data..[[nonce="]]..message.nonce..[[",]] end
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75 if message["qop"] then data = data..[[qop="]]..message.qop..[[",]] end
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76 if message["charset"] then data = data..[[charset=]]..message.charset.."," end
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77 if message["algorithm"] then data = data..[[algorithm=]]..message.algorithm.."," end
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78 if message["rspauth"] then data = data..[[rspauth=]]..message.rspauth.."," end
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79 data = data:gsub(",$", "")
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80 return data
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81 end
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82
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83 local function utf8tolatin1ifpossible(passwd)
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84 local i = 1;
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85 while i <= #passwd do
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86 local passwd_i = to_byte(passwd:sub(i, i));
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87 if passwd_i > 0x7F then
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88 if passwd_i < 0xC0 or passwd_i > 0xC3 then
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89 return passwd;
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90 end
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91 i = i + 1;
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92 passwd_i = to_byte(passwd:sub(i, i));
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93 if passwd_i < 0x80 or passwd_i > 0xBF then
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94 return passwd;
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95 end
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96 end
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97 i = i + 1;
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98 end
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99
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100 local p = {};
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101 local j = 0;
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102 i = 1;
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103 while (i <= #passwd) do
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104 local passwd_i = to_byte(passwd:sub(i, i));
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105 if passwd_i > 0x7F then
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106 i = i + 1;
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107 local passwd_i_1 = to_byte(passwd:sub(i, i));
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108 t_insert(p, to_char(passwd_i%4*64 + passwd_i_1%64)); -- I'm so clever
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109 else
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110 t_insert(p, to_char(passwd_i));
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111 end
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112 i = i + 1;
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113 end
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114 return t_concat(p);
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115 end
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116 local function latin1toutf8(str)
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117 local p = {};
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118 for ch in gmatch(str, ".") do
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119 ch = to_byte(ch);
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120 if (ch < 0x80) then
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121 t_insert(p, to_char(ch));
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122 elseif (ch < 0xC0) then
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123 t_insert(p, to_char(0xC2, ch));
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124 else
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125 t_insert(p, to_char(0xC3, ch - 64));
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126 end
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127 end
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128 return t_concat(p);
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129 end
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130 local function parse(data)
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131 local message = {}
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132 for k, v in gmatch(data, [[([%w%-]+)="?([^",]*)"?,?]]) do -- FIXME The hacky regex makes me shudder
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133 message[k] = v;
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134 end
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135 return message;
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136 end
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137
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138 local object = { mechanism = "DIGEST-MD5", realm = realm, credentials_handler = credentials_handler};
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139
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140 object.nonce = generate_uuid();
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141 object.step = 0;
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142 object.nonce_count = {};
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143
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144 function object.feed(self, message)
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145 self.step = self.step + 1;
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146 if (self.step == 1) then
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147 local challenge = serialize({ nonce = object.nonce,
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148 qop = "auth",
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149 charset = "utf-8",
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150 algorithm = "md5-sess",
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151 realm = self.realm});
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152 return "challenge", challenge;
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153 elseif (self.step == 2) then
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154 local response = parse(message);
294
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155 -- check for replay attack
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156 if response["nc"] then
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157 if self.nonce_count[response["nc"]] then return "failure", "not-authorized" end
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158 end
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159
294
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diff changeset
160 -- check for username, it's REQUIRED by RFC 2831
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161 if not response["username"] then
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162 return "failure", "malformed-request";
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163 end
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164 self["username"] = response["username"];
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165
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166 -- check for nonce, ...
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167 if not response["nonce"] then
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168 return "failure", "malformed-request";
294
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169 else
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diff changeset
170 -- check if it's the right nonce
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171 if response["nonce"] ~= tostring(self.nonce) then return "failure", "malformed-request" end
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172 end
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173
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diff changeset
174 if not response["cnonce"] then return "failure", "malformed-request", "Missing entry for cnonce in SASL message." end
294
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175 if not response["qop"] then response["qop"] = "auth" end
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176
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177 if response["realm"] == nil or response["realm"] == "" then
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178 response["realm"] = "";
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179 elseif response["realm"] ~= self.realm then
602
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180 return "failure", "not-authorized", "Incorrect realm value";
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parents: 599
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181 end
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182
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diff changeset
183 local decoder;
508
4fd60ae97535 Converting latin encoded responsed to utf-8 when needed.
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diff changeset
184 if response["charset"] == nil then
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185 decoder = utf8tolatin1ifpossible;
508
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186 elseif response["charset"] ~= "utf-8" then
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187 return "failure", "incorrect-encoding", "The client's response uses "..response["charset"].." for encoding with isn't supported by sasl.lua. Supported encodings are latin or utf-8.";
508
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diff changeset
188 end
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189
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190 local domain = "";
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diff changeset
191 local protocol = "";
294
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diff changeset
192 if response["digest-uri"] then
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diff changeset
193 protocol, domain = response["digest-uri"]:match("(%w+)/(.*)$");
402
50f1c09541cd Checking some variables for nil so no errors occur that'll break the server.
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parents: 401
diff changeset
194 if protocol == nil or domain == nil then return "failure", "malformed-request" end
294
5d861d6e5bbd Made SASL module fit the new interface.
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diff changeset
195 else
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196 return "failure", "malformed-request", "Missing entry for digest-uri in SASL message."
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diff changeset
197 end
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198
294
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199 --TODO maybe realm support
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200 self.username = response["username"];
1656
cf9220a364cd Fixing a SASL issue by always passing the realm from SASL framework init to the handlers.
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parents: 1585
diff changeset
201 local password_encoding, Y = self.credentials_handler("DIGEST-MD5", response["username"], self.realm, response["realm"], decoder);
405
62706c4e04cf Some ends too much.
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parents: 404
diff changeset
202 if Y == nil then return "failure", "not-authorized"
404
4801dbeccc2a Some changes to report more correct SASL failures. Support for disabled accounts.
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parents: 402
diff changeset
203 elseif Y == false then return "failure", "account-disabled" end
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diff changeset
204 local A1 = "";
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diff changeset
205 if response.authzid then
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diff changeset
206 if response.authzid == self.username.."@"..self.realm then
1374
e85726d084d6 Adding COMPAT comment.
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parents: 1305
diff changeset
207 -- COMPAT
1161
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diff changeset
208 log("warn", "Client is violating XMPP RFC. See section 6.1 of RFC 3920.");
1159
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diff changeset
209 A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid;
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diff changeset
210 else
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diff changeset
211 A1 = "?";
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diff changeset
212 end
f81c8cec0e71 Adding minimal support for authorization identities to workaround buggy SASL implementations.
Tobias Markmann <tm@ayena.de>
parents: 1158
diff changeset
213 else
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parents: 1158
diff changeset
214 A1 = Y..":"..response["nonce"]..":"..response["cnonce"];
f81c8cec0e71 Adding minimal support for authorization identities to workaround buggy SASL implementations.
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diff changeset
215 end
603
423fd24fff54 Removed the unnecessary idna.to_ascii applied to the DIGEST-MD5 disgest-uri response values, which was causing auth failures with some clients.
Waqas Hussain <waqas20@gmail.com>
parents: 602
diff changeset
216 local A2 = "AUTHENTICATE:"..protocol.."/"..domain;
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diff changeset
217
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218 local HA1 = md5(A1, true);
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diff changeset
219 local HA2 = md5(A2, true);
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diff changeset
220
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diff changeset
221 local KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2;
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diff changeset
222 local response_value = md5(KD, true);
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diff changeset
223
294
5d861d6e5bbd Made SASL module fit the new interface.
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diff changeset
224 if response_value == response["response"] then
5d861d6e5bbd Made SASL module fit the new interface.
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parents: 292
diff changeset
225 -- calculate rspauth
603
423fd24fff54 Removed the unnecessary idna.to_ascii applied to the DIGEST-MD5 disgest-uri response values, which was causing auth failures with some clients.
Waqas Hussain <waqas20@gmail.com>
parents: 602
diff changeset
226 A2 = ":"..protocol.."/"..domain;
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diff changeset
227
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diff changeset
228 HA1 = md5(A1, true);
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diff changeset
229 HA2 = md5(A2, true);
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diff changeset
230
294
5d861d6e5bbd Made SASL module fit the new interface.
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diff changeset
231 KD = HA1..":"..response["nonce"]..":"..response["nc"]..":"..response["cnonce"]..":"..response["qop"]..":"..HA2
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diff changeset
232 local rspauth = md5(KD, true);
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diff changeset
233 self.authenticated = true;
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diff changeset
234 return "challenge", serialize({rspauth = rspauth});
294
5d861d6e5bbd Made SASL module fit the new interface.
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parents: 292
diff changeset
235 else
5d861d6e5bbd Made SASL module fit the new interface.
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diff changeset
236 return "failure", "not-authorized", "The response provided by the client doesn't match the one we calculated."
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diff changeset
237 end
294
5d861d6e5bbd Made SASL module fit the new interface.
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parents: 292
diff changeset
238 elseif self.step == 3 then
297
15b375870b40 Providing some human readable error messages and some fixes.
Tobias Markmann <tm@ayena.de>
parents: 294
diff changeset
239 if self.authenticated ~= nil then return "success"
15b375870b40 Providing some human readable error messages and some fixes.
Tobias Markmann <tm@ayena.de>
parents: 294
diff changeset
240 else return "failure", "malformed-request" end
294
5d861d6e5bbd Made SASL module fit the new interface.
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parents: 292
diff changeset
241 end
5d861d6e5bbd Made SASL module fit the new interface.
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parents: 292
diff changeset
242 end
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diff changeset
243 return object;
276
30893439d5d1 Some early attempts on DIGEST-MD5.
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parents: 50
diff changeset
244 end
30893439d5d1 Some early attempts on DIGEST-MD5.
Tobias Markmann <tm@ayena.de>
parents: 50
diff changeset
245
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diff changeset
246 -- Credentials handler: Can be nil. If specified, should take the mechanism as
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diff changeset
247 -- the only argument, and return true for OK, or false for not-OK (TODO)
edc066730d11 Switch to using a more generic credentials_callback/handler for SASL auth.
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diff changeset
248 local function new_anonymous(realm, credentials_handler)
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diff changeset
249 local object = { mechanism = "ANONYMOUS", realm = realm, credentials_handler = credentials_handler}
799
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
Tobias Markmann <tm@ayena.de>
parents: 760
diff changeset
250 function object.feed(self, message)
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
Tobias Markmann <tm@ayena.de>
parents: 760
diff changeset
251 return "success"
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
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parents: 760
diff changeset
252 end
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
Tobias Markmann <tm@ayena.de>
parents: 760
diff changeset
253 object["username"] = generate_uuid()
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
Tobias Markmann <tm@ayena.de>
parents: 760
diff changeset
254 return object
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
Tobias Markmann <tm@ayena.de>
parents: 760
diff changeset
255 end
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
Tobias Markmann <tm@ayena.de>
parents: 760
diff changeset
256
b7ea802f3527 Adding inital support for ANONYMOUS mechanism in SASL.
Tobias Markmann <tm@ayena.de>
parents: 760
diff changeset
257
1585
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diff changeset
258 function new(mechanism, realm, credentials_handler)
15
c0d754774db2 adding SASL lib with PLAIN support, not tested yet
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parents:
diff changeset
259 local object
1585
edc066730d11 Switch to using a more generic credentials_callback/handler for SASL auth.
nick@lupine.me.uk
parents: 1518
diff changeset
260 if mechanism == "PLAIN" then object = new_plain(realm, credentials_handler)
edc066730d11 Switch to using a more generic credentials_callback/handler for SASL auth.
nick@lupine.me.uk
parents: 1518
diff changeset
261 elseif mechanism == "DIGEST-MD5" then object = new_digest_md5(realm, credentials_handler)
edc066730d11 Switch to using a more generic credentials_callback/handler for SASL auth.
nick@lupine.me.uk
parents: 1518
diff changeset
262 elseif mechanism == "ANONYMOUS" then object = new_anonymous(realm, credentials_handler)
38
Matthew Wild <mwild1@gmail.com>
parents: 32
diff changeset
263 else
Matthew Wild <mwild1@gmail.com>
parents: 32
diff changeset
264 log("debug", "Unsupported SASL mechanism: "..tostring(mechanism));
285
372d0891e8fd Made PLAIN method in sasl.lua module follow new interface.
Tobias Markmann <tm@ayena.de>
parents: 280
diff changeset
265 return nil
15
c0d754774db2 adding SASL lib with PLAIN support, not tested yet
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
266 end
c0d754774db2 adding SASL lib with PLAIN support, not tested yet
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
267 return object
c0d754774db2 adding SASL lib with PLAIN support, not tested yet
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
268 end
c0d754774db2 adding SASL lib with PLAIN support, not tested yet
Tobias Markmann <tm@ayena.de>
parents:
diff changeset
269
519
cccd610a0ef9 Insert copyright/license headers
Matthew Wild <mwild1@gmail.com>
parents: 508
diff changeset
270 return _M;